Electrical switch



Sept. 7, 1926.

H. BLUMBERG ELECTRICAL SWITCH Filed July 6 1923 Jrman ATTORNEY.

WITNESS:

Patented Sept. 7, 1926.

UNITED STATES HERMAN BLUMBERG, OF BROOKLYN, NEW YORK..

ELECTRICAL SWITCH.

Application filed July 6,

This invention relates to electrical switches.

Some of the objects of the present invention are :--to produce a switch which is especially adapted for use in connection with hook-ups of wireless systems for selectively cutting in and cutting out certain instrumentalities of the hook-up without involving extensive use of wire connections, and in fact reducing the use of wire connections to the minimum; to produce an electrical switch of dual character in that the same will operate with a double pole eflect and a triple pole effect; a switch having diametrically opposed bridge pieces on a rotatable element which co-act respectively with pairs of adjacent contacts to thus reduce the number of contacts used for obtaining a certain result; to employ on a rotatable element, a bridge piece of flexible material which may be moved into and out of engagement with selected pairs of contacts.

Vith these and other objects in view, the invention resides in the particular provision, relative disposition and function of the parts hereinafter fully described and illustrated in the accompanying drawing, in which Figure 1 is a diagrammatic View of a portion of a wireless receiving system showing the aerial circuit and the oscillating circuit, and the contact arrangement of the switch used therewith and indicating a double circuit connection.

Figure 2 is a view similar to Figure 1 showing a single circuit connection.

Figure 3 is a longitudinal sectional View through the switch.

Figure 4 is a transverse sectional view taken in the line 44 of Figure 3.

Figure 5 is a detail view of one of the bridge pieces.

In the use of wireless receiving systems it is necessary at times to change the condition of the system so as to accommodate long wave lengths on the one hand and short wave lengths on the other hand for best results. In systems or hook-ups employing the usual primary and secondary induction coil, in some cases best results are obtained by the induction of the secondary coil of the oscillating circuit by the primary coil of the aerial circuit. In another case proper results may be obtained by cutting out the primary coil of the aerial circuit and using merely the secondary coil with its greater number of turns as a primary coil in conjunction with the 1923. Serial no. 649,877.

aerial, and to this end a switch as illustrated and hereinafter described is employed in conjunction with the hook-up as shown. The switch 10, generally, comprises a contact carrying member 11 and a bridge piece carrying element 12 of insulating material which has a compound movement with respect to the member 11. The element 12 has compound movement with respect to the member 11 by virtue of an arbor 13 carried by said element 12 which extends through a central hole in the member 11; a spring 1 1 being arranged between the member 11 and a collar 15 adjustably mounted on the arbor 153. The member 11 carries preferably six contats 16 which are circum-iercntially arranged and which are spaced equi-distantly apart with respect to each other, and each having im printed therein a number 17. The numbers 17 are arranged numerically and clockwise of the contacts as shown in Figures 1, 2 and 4. Each of the contacts is extended through the member 11 to provide binding posts 18 for effecting the wire connections and for the mounting of the switch in its entirety to a suitable panel. Bridge pieces 19 are at tached to the element 12 at diametrically 0pposite points thereof, and each. of the bridge pieces consists of angularly disposed portions 20 and 21; the portion 20 serving for the attachment of the bridge piece, whereas, the poriton 21 serving for bridging a pair of contacts and the same being flexible. It will now be manifest that by turning the element 12 the bridge pieces 19 may be made to bridge the adjacent contacts 16 in pairs for a double pole action. In order that a triple pole action may be obtained one of the contacts 16, preferably the contact having the number 3 is electrically connected to the arbor 13 by virtue of the *ire 22 connected to the binding post of said contact and to connector 23 carried by the arbor 13 in electrical contact therewith; and a bridge piece holder 24: connected to the arbor l3 and capable of being moved into and out of engagament with the yieldable auxiliary contact 25 carried by the contact having the number 6.

Inthe diagrams shown in Figures 1 and 2, contact 1 is connected to one side of the primary coil P to the opposite side of which is connected a condenser C and contact i in the order named; contact 2 is connected to the aerial A; contact 3 is connected to the arbor 13 and to one side of a condenser X,

in the case which latter is connected to one side oil? the secondary coil S Whose other side is connected to contact 6; and contact 5 is connected to the ground. It will be apparent on rei? erence to Figure 1 that the portion of the hook-up shown is in condition to include the yro circuits including the primary ll and secondary S induced by the il'orruer and the conden: C and W connected at parallel; this c'nnection. Whereas. in 7 and condenser C is cut ont of the secondary S a series only as a lengths; eatures beiir; z

honn in ntacts 1 a1 try coil L ise s made X in 19. bridge co spedirely, and the bride piece at the same time engage: contact 25,

treinity of the part beinc in to maintain the position. ll hereas in the case shown in Figure the IHMl O pieces 19, bridge contacts and 3 and 5 and 6 respectively in pairs and the bridge holder 2% is then out of contact with the contact 25. it this time the extremity of the holder ill is in a second recess 26. At each of the recesses 96 is an indicating number and letter to indicate position and etlect of the switch, in other Words to indicate that in one posi tion a triple pole action will be obtained and in the other position a double pole action will be obtained.

What is claimed new is 1. An electric svitch comprising circumfcrentially arranged contacts, a rotatable element. bridge pieces on said rotatable ele ment and arranged diametrically opposite each other, :11 arbor on which said element is mounted for rotation therewith, said arbor bang electrically connected to one of said contacts, one of said contacts baring a yieldable poi-thin. and a bridge. piece con nected to said arbor and movable ii to and out of engagement with said yieldable portion.

9-. A switch of the clnractcr d s rilaid comprising a contact carrying element, a plurality of contact clenrnts circuin'l'erentially arranged thereon. one oli said contacts having a yieldable portion thereon. an arbor passing centrally through the coinacr arrying element, a pair at trill-L1? pieces *arried by the arbor and insulatfrom and adapted to enn'age the contacts in pairs and each bridge piece beinr: arr; red upon diametrically opposite (P: he

arbor, a third bridge piece carried by said arbo' and movable into and. out ot 021"Llfjt3- meut with said yicldable portion. said la bridge piece disposed at right angle to the radial position of said pair o't' bridge pieces. a coil spring surroru'uling the arbor. and a collar adjustably mounted upon the arbor and being associated with the one cad ol' the coil spring as and :for the purpose specified.

In testimony whereof I have allixed my signature.

(ill

HERMAN BLUMBERG. 

